An experiment 20 years ago used optical methods to observe the Earthâs core, leading to a temperature estimate of the Earthâs core at about 5000 degrees Celsius. However, those results may have been thrown off the presence of recrystallizing iron particles â which can throw off the experiment.
The news that China is now the largest economy in the world is an embarrassment for Barack Obama and ends America's 142 years at the top.Britain had out-produced the U.S. and its European rivals for much of the 19th century, at the height of the industrial revolution and with trade links across the Empire.n 1872, its economy overtook Britain to become the world's largest, a position it held for the next 142 years. Productivity, leading brands and innovation, coupled with the success of the US dollar and the fact that 62 per cent of the world's financial reserves are held in the currency, kept America on top.
As a continent, the economy of Europe is currently the largest on Earth and it is the richest region as measured by assets under management with over $32.7 trillion compared to North America's $27.1 trillion in 2008.